Untrusted Device Access via Trusted Intermediary Authentication

The patent introduces an authentication key as an intermediary element that mediates between the user and the untrusted device. Instead of implementing complex per-device access control mechanisms directly on the device, the system uses a simple authentication key (displayed as visual code or sound) that the user presents to the device. This intermediary simplifies the interaction while maintaining security, as the device only needs to verify the authentication key rather than implement full access control management.

The patent creates a copy of the authentication mechanism by generating an authentication key that can be displayed in multiple formats (visual code on screen, sound output). This copying approach allows the authentication information to be transferred to the untrusted device through various channels, simplifying the access control process while maintaining security. The device receives and processes this copied authentication information without needing complex access control infrastructure.

The authentication key serves as an intermediary that simplifies the authorization process. Instead of requiring users to navigate complex access control settings or enter multiple credentials on untrusted devices, the system provides a simple authentication key that can be presented visually or through sound. This intermediary element bridges the gap between fine-grained access control requirements and user convenience, allowing rapid authorization while maintaining data privacy.

The patent replaces traditional mechanical authentication methods (keyboards, mice, complex UI interactions) with alternative sensing methods. The untrusted device uses its camera to capture visual authentication codes or its microphone to capture sound-based authentication keys. This substitution eliminates the need for complex manual input on devices with limited interfaces, greatly improving ease of operation while maintaining secure authentication.

The patent replaces mechanical input methods (keyboard typing, mouse clicking) with sensor-based authentication. The untrusted device uses its camera sensor to capture visual authentication codes displayed on a trusted device, or its microphone sensor to capture sound-based authentication keys. This substitution maintains security by using unique authentication credentials while dramatically improving ease of operation, as users simply need to display or speak the authentication key rather than manually input complex credentials on an unfamiliar device.

The authentication key is created as a copy of the user's identity credentials that can be transferred through multiple media formats (visual display, sound output). This copied authentication information can be presented to the untrusted device through simple actions like displaying a screen or playing a sound, eliminating the need for complex manual input while maintaining the security properties of the original authentication mechanism.

The authentication key acts as an intermediary security layer that enables adaptability to untrusted devices without compromising security. The device receives and verifies the authentication key, which serves as a mediator between the user's trusted credentials and the untrusted device environment. This allows the system to adapt to various untrusted devices (public computers, borrowed phones, smart TVs) while maintaining security through the authentication key verification process.

The patent implements local quality by providing different authentication experiences tailored to each device type. The authentication key can be presented in formats suitable for the specific device capabilities (visual code for devices with screens, sound for devices with audio output). This localized approach allows secure access to diverse untrusted devices while adapting to their specific characteristics, improving adaptability without sacrificing security.